The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.63 to $9.79, inclusive. The reporting person undertakes to provide to Western Alliance Bancorporation, any security holder of Western Alliance Bancorporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within this range.

(2)

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.6214 to $9.79, inclusive. The reporting person undertakes to provide to Western Alliance Bancorporation, any security holder of Western Alliance Bancorporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within this range.

(3)

On September 17, 2012, WAL-10, LLC, of which reporting person has no investment or voting control, transferred 14,066 shares to The Marianne E. Boyd Trust, dated January 9, 2007.

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